Shoe-sole-stitching mechanism



H. MICHELSEN. D SHOE SOLE STITCHING MECHANISM.

APPLICATION FILED APR. I4, I9I9.

Patented Feb. 22, 192-1.

' m mm PATENT os'ncs.

HANS MICHELSEN, OF MINNEAPOLIS, MINNESOTA.

SEOE-SOLE-STITCEING MECHANISM.

Specification of Letters Patent.

PatentedFeb. 22, 1921.

Application filed April 14, 1819. Serial No. 289,982.

To all whom it may omwern:

Be it known that I, HANS MIorrEnsnN, a citizen of the United States, residing at Minneapolis, in the county of Hennepm and State of Minnesota, have invented certain new and useful Improvements in Shoe-Sole- Stitching Mechanism; and I do hereby declare the following exact description of the inventlon, such as will enable others skilled in the art to WhlGh it a pertains to make and use the same.-

y invention relates to shoe sole stitching mechanism and is in the improvement on the presser foot for sole stitchin machines disclosed in my prior Patent 0. 989,511, of date April 11, 19 1, and on the sole stitching mechanism d15- closed and claimed in my prior Patent 'No. 1,083,373, of date January 6, 1914.

My present invention is in the nature of a presser foot and attachments therefor, whereby channels, to wit, either creases or grooves, may be cut in a shoe sole slmultaneously with the stitching action and in a hi hly efiicient manner.

enerally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims. v

In the accompanying drawings which illustrate the invention, like characters mdicate like parts throughout the several views.

Referring to the drawings Figure 1 is a view in side elevation showing the invention applied to the presser foot bar of a sole stitching machine of any of the well known types; I

Fig. 2 is a plan view of the parts shown 1n Fig. 1, some parts being sectioned;

Fig. 3 is a front elevation of the parts shown in Figs. 1 and 2, a two layer sole being shown in section on the stitching line;

Fig. 4 is a detail chiefly in section but partly in elevation showing the manner in which the presser foot toe is pivoted to the presser foot proper;

Fig. 5 is'a plan view of the presser foot toe shown in Fig. 4;

Fig. 6 is a detail corresponding to Fig. 3,

' but showing portions of the attachment removed; and

Fig. 7 is a plan view showing a presser foot toe of hook-like form.

The character a indicates a two-layer shoe sole which is being stitched. Of the parts to be a full, clear, and

nature of an of the machine, in so far as it is desirable for the purposes of this case to note the same, the numeral 8 indicates the fixed table or needle plate, the numeral 9 the vertically movable awl, the needle 10,.and presser foot bar 11, which latter, as is well known, is given an intermediate vertical movement so as to permit the step-by-step feeding movement of the shoe sole under the action of the customary feeding mechanism. This vertically movable presser foot bar 11 carries my improved pre er foot and the attachments thereto, as will now be noted.

The presser foot proper indicated by the numeral 12, at its upper portion, is in the form of a plate having perforations 12 therein, and it is rigidly but ad'ustably secured to the presser foot bar 11 y machine screws 13 passed through perforations in said bar, and through the perforations 12' and have their threaded ends, screwed into a clamping plate 14. The erforations 12' are considerably larger in dlameter than the screws 13 so that the said presser foot is capable of limited universal movements in the vertical plane in which it is fixed, this being important, as will presently appear. The presser foot toe 15 is swiveled to the lower portion of the presser foot 12 for limited oscillatory movements on horizontal axis so as to adapt itself to irregularities in the sole or to slightly tilted positions of the sole; and this pivotal connection is prefer-. ably made of a strong bolt screw 16, the head of which is countersunk into the foot 12 and the threaded end of which is screwed into the foot 15. The lower portion of this presser foot toe, of course, engages directly with the shoe sole. The toe shown in Fig. 7 is like that illustrated in the other views, except that it is provided with a hook-like end 15 which is better adapted to close th creases after the stitching of the sole.

For forming a crease in the shoe sole for the stitches, I employ a knife, but for forming a groove, I employ a bar having a tubular groove cutter at its lower end. These two tools are herein broadly referred to as channel forming tools and the term channel is used in a sense broad enough to include either a crease cut by a knife or a groove cut out by a groove cutting tool.

The knife and the groove cutter may be .endwise movementson a line oblique to the sole and inthe vertical plane of the stitching line, in a so-called tool plate which in fact, is a sort of supplemental adjustable part of the presser foot. This tool plate 18 is adjustably connected to the resser foot bar to screws 19 and 20. T e screw 19 is screwed into the body of the presser foot 12 and works in a horizontal slot 21 of the toolplate 18, while the screw is screwed into an arm 12 of said presser foot and works in a horizontal roove 22 of said plate 18. The upper end of the arm 12 has a rigid horizontally projecting screw-threaded stem 23. A nut 24 having a knurled head works on the stem 23 and has a swivel connection to a laterally projecting flange 18" of the tool plate, so that by adjustments of the nut 24, the tool plate can be adjusted horizontally toward and from the awl 9 but without nut 25, the tool maybe raised and lowered.

In the arrangement illustrated in F i s. 1 to 3, inclusive, the tool 17 is provide at 1ts lower end with a crease cutting blade 17, while in the arrangement shown in Fig.6,

said tool is provided at its lower end with a tubular groove cutter 17 At its intermediate'portlon, the tool 17 is preferably provided with a flattened portion 17 adapted to be engaged by a set screw 26 threaded through one edge of the tool plate 18, to hold the tool securely in any adjustment in which it may be set and against rotation.

The adjustment of the entire presser foot attachment, permitted by the enlarged holes 12' is required to set the same properly in respect to the awl and the needle. The horizontal adjustment of the tool plate 18 permits setting of the knife or groove cutter always to proper dlstance ahead of the awl,

regardless of the length of the stitches. It.

of course, is understood that for sole stitch ing machines, it is customary to' produce the feeding action of the sole by horizontal movements of the awl in the vertical plane of the stitching line. The vertical or obhaving lique adjustments of the knife or grooving The efiiciency of the invention herein dis.'

closed and above described, has been thoroughl demonstrated in practice. In the use 0 the knife for forming a crease for the stitches, it is desirable to press down the walls of crease over the stitches and this will be automatically done when the hook-like presser foot toe, shown in Fi 7,is used. When stitches are being ma e in grooves formed by the grooving tool, either form of presser foot toe may be used, but the form'shown in Flgs. 1' to 6, inclusive, will probably usually be emplo ed.

What claim is:

1. A presser foot attachment for shoe sole stitching machines, foot that ,is detachably securable to the presser foot bar of the machine, a tool plate rigidly secured to said foot with freedom for approximately horizontal forward and rearward adjustments, and a channel forming tool rigidly secured to said tool plate but adjustably to raise and lower said tool independently of the horizontal adjustment of saidtool plate.

the crease so as to close the comprising a presser 2. A presser foot attachment for shoe sole Y stitching machines, comprising a presser foot that is detachably securable to the presser foot bar of the machine, said foot a laterally projecting vertical arm, a toolplate connected to said arm for approximately horizontal forward and rearward sliding movements, a nut and bolt con- I nection between said arm and tool plate for adjusting the latter, a channel forming tool obli' uely applied to said tool plate and depen ing from the same, and a nut and bolt connection between the plate and tool for,

verticall adjusting the latter independently of the a justment of said tool plate.

In testimon whereof I aflix my signatur in presence 0 two witnesses.

BERNICE G. BAUMANN, HARRY D. KILGORE. 

